It's half whole milk and half cream. If you're looking to cut calories, it of course has an advantage over cream, assuming you use the same amount of each.

I think the "cream is better" mentality is from when everyone thought carbs were totally evil and that eating more fat was always better. Sometimes lower fat higher carb IS better, but not always.

Actually this is not really the case. It's not about the carbs. The reason is more due to the lactose content, also to do with the processing that occurs to make it low fat. Also if you want nutrient absorption you need the fat.

You should read the ingredients on the half-and-half. Not all half-and-half is the same. Some has a lot more artificial things, and if you get it from a grocery store, they do not necessarily label it as ultrapasturized, which it may very well be. It's safer to get heavy cream or half-and-half from the healthfood store, somewhere that has foods clearly labeled ultrapasturized. It'll usually be in a glass container and it'll be hard to use it all before it goes bad. But it's better for you.

Thanks guys!!! I heard milk gets broken down into lactose more quickly than cream???

It's not that milk is broken down into lactose, but rather that the lactose is more prevalent.

Whole milk contains water, fat, protein and sugar.

When heavy cream is skimmed off the top, it contains less of the protein and sugar, while concentrating the fat.
It's not just a matter of carbs, as lots of people have issues with lactose (the sugar), and dairy proteins are not necessarily well tolerated and kind of controversial. The proteins and sugar in dairy are actually quite insulin-stimulating, which is not something you want in the weight loss phase.

I think you'll get more bang for your buck pouring heavy cream into your coffee as opposed to half and half.
You don't have to use very much and it makes it so creamy and delicious.

Milk isn't broken down into lactose, lactose is a sugar found in milk.
Some people are intolerant to lactose, as they lack lactase, which is necessary to break lactose into simpler sugars.
If you ever see ase at the end of a compound, you know that it's function is breaking something down into simpler forms.
An ose suffix at the end of a compound indicates that it's a sugar.

If you lack the gene to produce lactase, you won't be able to digest lactose.

Heavy cream is going to contain trace amounts of lactose, but much less than milk or half-and-half would. Just as butter, which is concentrated cream without the buttermilk (leftover liquid after making butter from cream) has even less sugar and protein than heavy cream.

Even for those who are not lactose intolerant, the proteins (especially casein) can be problematic. Casein avoidance is my main reason for avoiding delicious cheese, which is basically free of lactose.

My limited understanding of the whole 30 is going 30 days without foods that are often problematic for people or 30 days without neolithic foods. To have a perfect "paleo" diet, one wouldn't consume dairy products.